HMSK-80 valve lash spec - Snowblower Forum : Snow Blower Forums
 
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post #1 of 9 Old 10-08-2015, 05:06 PM Thread Starter
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HMSK-80 valve lash spec

I'm hoping some can give some input on this.
I've seen a single 0.006" in one Tecumseh manual and then another Tecumseh manual shows 0.008" and 0.012" but doesn't specify for what.

I've seen some say 0.008" to 0.012" is a range, while others say 0.008" is intake and 0.012" is exhaust.

What gives!?


I'm thinking 0.008" for intake and 0.012" for exhaust makes the most sense but want to know what it should actually be.

1999 Ariens 924108 824SLE.

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post #2 of 9 Old 10-08-2015, 05:27 PM
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i would just grind the stem a little bit at a time until the valve doesnt spin in the seat
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post #3 of 9 Old 10-08-2015, 05:33 PM Thread Starter
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Quote:
Originally Posted by 43128 View Post
i would just grind the stem a little bit at a time until the valve doesnt spin in the seat

How will this compensate for when the exhaust valve gets good and hot?

1999 Ariens 924108 824SLE.

1933 GE Monitor Top refrigerator restoration video

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post #4 of 9 Old 10-08-2015, 05:41 PM
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I would think that using the engine numbers you should be able to narrow down the proper specs for it. Perhaps you can post the engine numbers and maybe a member can help you reseach that.
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post #5 of 9 Old 10-08-2015, 06:22 PM
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Page-64 shows .006 clearance for both valves on an HMSK80 motor.

http://www.barrettsmallengine.com/ma...hreference.pdf

Page-101 shows .008 clearance for both valves on an HMSK80 motor

http://www.barrettsmallengine.com/ma...headmanual.pdf

I "think" I set my HM80 clearances to .008 on each valve. I guess you could set them to .007 and be in range since they allow .002 up or down from specified clearances.???

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Last edited by Grunt; 10-08-2015 at 06:37 PM. Reason: Add another link
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post #6 of 9 Old 10-08-2015, 06:23 PM
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ive done it that way before on flatheads and it worked for me every time. if you want i would say .10
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post #7 of 9 Old 10-08-2015, 08:44 PM Thread Starter
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Quote:
Originally Posted by Grunt View Post
Page-64 shows .006 clearance for both valves on an HMSK80 motor.

http://www.barrettsmallengine.com/ma...hreference.pdf

Page-101 shows .008 clearance for both valves on an HMSK80 motor

http://www.barrettsmallengine.com/ma...headmanual.pdf

I "think" I set my HM80 clearances to .008 on each valve. I guess you could set them to .007 and be in range since they allow .002 up or down from specified clearances.???
Hi Grunt,
I see two clearances listed on page 101 of the section manual, .008 and .012.

1999 Ariens 924108 824SLE.

1933 GE Monitor Top refrigerator restoration video

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post #8 of 9 Old 10-08-2015, 11:02 PM
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I remember someone else here saying one was intake and the other was exhaust, but if you look at other items on the table they are obviously a min/max range.
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post #9 of 9 Old 10-09-2015, 08:45 AM Thread Starter
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I noticed Briggs and Stratton lists the following for the 1992 L head 8HP cast iron sleeve engine on my generator.

Intake : .005 / .007
Exhaust : .009 / .011


I'm thinking like has been said, 008 - 012 is a range as per the Tecumseh manual but I may try to keep the exhaust towards the larger side of that range and the intake closer to the smaller. Maybe do .008 for intake and .010 for exhaust. Obviously if the intake is already larger but within spec I'm not changing it. Will be lapping the valves for good measure before finalizing clearances.

The reason I'm doing this is, as some may remember my Tecumseh runs awesome until you work it hard blowing snow for a while, then it starts running terrible until you let it cool down for a bit, even idling for 10-15 minutes helps.

The assumption is the exhaust valve clearance is too tight.

I'll know more on Saturday.

1999 Ariens 924108 824SLE.

1933 GE Monitor Top refrigerator restoration video

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Last edited by ChrisJ; 10-09-2015 at 08:55 AM.
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